I have decided to make a Volvo birthday cake for my husbands 40th. I am planning on making 2 of 12" x 6" cakes so that i can stack one on top of the other and carve it. Do i need to chill the cake before carving? Do i need to put supports into the cake? Am i best to make a particular type of sponge cake?

Any advise would be greatly appreciated as these types of cakes are not "normal" in the UK!